Question

V50 + 6V2 - 198 =
.......??????​

Answer 1

$\ \ \ \sqrt{50} + 6\sqrt{2} - \sqrt{98}\\\\=\sqrt{25\cdot2} + 6\sqrt{2} - \sqrt{49\cdot2}\\\\=5\sqrt{2} + 6\sqrt{2} - 7\sqrt{2}\\\\=5\sqrt{2} + 6\sqrt{2} - 7\sqrt{2}\\\\=4\sqrt{2}$